Daiichi Sankyo Files New Drug Application for DS-8201 in Japan

Daiichi Sankyo Files New Drug Application for DS-8201 in Japan
Daiichi Sankyo has submitted an application to Japanese regulatory authorities asking that its investigational therapy trastuzumab deruxtecan (DS-8201) be approved as a treatment for people with HER2-positive metastatic breast cancer. The New Drug Application (NDA) is based on results from the multi-center, randomized, open-label DESTINY-Breast01 Phase 2 trial (NCT03248492) and a previous Phase 1 clinical trial (NCT02564900). The Phase 1 trial tested DS-8201 in people with different types of HER2-positive cancers, including 115 women with HER2-positive breast cancer. Results showed that patients with metastatic breast cancer who had progressed after treatment with anti-HER2 therapies such as Kadcyla responded particularly well to the treatment. Tumors shrank at least partially in 60% of these patients, and 90% of patients achieved at least stable disease. The treatment did not cause significant side effects. The ongoing Phase 2 DESTINY-Breast01 trial is testing DS-8201 in 253 patients with inoperable and/or metastatic HER2-positive breast cancer, recruited in over 100 sites across North America, Europe, and Asia. The primary endpoint of the trial is objective response rate — the percentage of patients whose cancer disappears or is reduced significantly after the treatment. Secondary objectives include duration of response, progression-free survival (the time patients live without their disease worsening), and overall survival. So far, the results of the DESTINY-Breast01 trial confirm those of the Phase 1 trial. Daiichi Sankyo plans to present the partial results at an upcoming medical meeting. "We are proud to initiate this critical next step in the regulatory process in Japan and look forward to the presentation of the phase 2 DESTINY-Breast01
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